[Code of Federal Regulations]

[Title 14, Volume 1]

[Revised as of January 1, 2006]

From the U.S. Government Printing Office via GPO Access

[CITE: 14CFR31.43]



[Page 762-763]

 

                     TITLE 14--AERONAUTICS AND SPACE

 

CHAPTER I--FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION

 

PART 31_AIRWORTHINESS STANDARDS: MANNED FREE BALLOONS--Table of Contents

 

                      Subpart D_Design Construction

 

Sec. 31.43  Fitting factor.



    (a) A fitting factor of at least 1.15 must be used in the analysis 

of each fitting the strength of which is not proven by limit and 

ultimate load tests



[[Page 763]]



in which the actual stress conditions are simulated in the fitting and 

surrounding structure. This factor applies to all parts of the fitting, 

the means of attachment, and the bearing on the members joined.

    (b) Each part with an integral fitting must be treated as a fitting 

up to the point where the section properties become typical of the 

member.

    (c) The fitting factor need not be used if the joint design is made 

in accordance with approved practices and is based on comprehensive test 

data.